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Posted by: PRS914-6 Feb 11 2007, 11:09 AM

I'm building a 915 tranny in my spare time and just got the machining done for the R&P flop.

The speedometer pickup will have to be machined into the side of the side cover. Unfortunately, it will not be nearly as close to the magnetic ring as original.

Anyone done this with success?

Posted by: GeorgeRud Feb 11 2007, 03:44 PM

We did machine a pickup point on the side cover of my 915 by dremeling away part of a stiffening rib, and flattening the cover to mount the pickup. We safety wired the pickup onto the adjacent ribs, and it's worked fine. You do have to have a pretty strong signal through the case to pick up the magnetic pulses, but it's been working fine. I used the quarter sized pickup, I believe the later ones are smaller.

I believe it would be easier to get an aftermarket billet side cover that would be easier to machine, but mine works nicely.

Posted by: PRS914-6 Feb 11 2007, 04:00 PM

Thanks George. Really don't want to buy a billet cover. The thrust is in the opposite direction and I feel the billet is a waste of money.

What I was thinking was to filll a small area around the fins with Devcon metal filler. Then set it up in the milling machine and machine an area just like original.

However, the distance will be about twice as far to the magnets as the original side. It sounds like it still works though and that is good news.

Posted by: dflesburg Feb 11 2007, 04:14 PM

pictures!!! pictures!!! pictures!!!

Posted by: dekman Feb 11 2007, 04:40 PM

Just did a 915Wevo with billet side cover with speedo mount(wimped out...cover was about $300). Will try to load pic's........good luck!

Attached image(s)

Posted by: Aaron Cox Feb 11 2007, 05:07 PM

dekman,

did you have to add the extensions on your muffler to clear the wevo?

Posted by: mikez Feb 11 2007, 05:08 PM

QUOTE(PRS914-6 @ Feb 11 2007, 09:09 AM)

I'm building a 915 tranny in my spare time and just got the machining done for the R&P flop.

The speedometer pickup will have to be machined into the side of the side cover. Unfortunately, it will not be nearly as close to the magnetic ring as original.

Anyone done this with success?

As one who was just helped break one off during a 911 instal....can't you use the stock 915 drive and then hang an adapter off the end?

BTW...do you are Dekman have an extra 915 nose cone that you want to sell?

Posted by: PRS914-6 Feb 11 2007, 06:37 PM

Mike, don't understand your question. Are you talking mechanical speedo?
Here is a pic of the ring gear swapped and a stock cover. Note the thrust is now towards the solid part of the case unlike using it in a 911.
Attached Image

Posted by: Aaron Cox Feb 11 2007, 06:40 PM

i think mike meant... why not use the mechanical sender to provide an electronic signal? still need some sensor/adapter thing..

Posted by: PRS914-6 Feb 11 2007, 06:42 PM

And here is how the speedo pickup is recessed in the case (stock)
Attached Image

Posted by: PRS914-6 Feb 11 2007, 06:54 PM

QUOTE(Aaron Cox @ Feb 11 2007, 04:40 PM)

i think mike meant... why not use the mechanical sender to provide an electronic signal? still need some sensor/adapter thing..

WEVO setup does not accommodate the mechanical speedo. I wish it did.....

Posted by: East coaster Feb 11 2007, 08:57 PM

I still need to do this to my car.

It would be nice to have a speedo (not the marble sack type).

Posted by: dekman Feb 11 2007, 10:21 PM

Aaron = yes. "Z" = yes.

Posted by: John Feb 12 2007, 12:30 PM

Do you have any pics showing what had to be done to the case to flip the ring gear.

I'm interested to see what exactly needed to be done.

Thanks.

Posted by: PRS914-6 Mar 10 2007, 08:25 PM

OK, I machined my side cover and pressed in a cup to receive the sensor. It was a lot of work but free....The sensor is now exactly the correct distance from the magnets.

Here are a few pics....
In the lathe
Attached Image
Cup made with .004 press fit.

The finished product